Board of Governors of the Federal Reserve System (U.S.), 1935-. "Summary Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "April 16, 1985," G.12.3 Industrial Production (1985-04-16) : 13-13. https://fraser.stlouisfed.org/title/55/item/59691/toc/473036 , accessed on May 5, 2024.